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Modality shares its root with the word mode, meaning the way in which something happens or is experienced. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood. In logic, modality has to do with whether a proposition is necessary, possible, or impossible.
modal | single modal [sense-specific] | modal auxiliary [sense-specific] of or pertaining to mode, manner, or form. | [music] ; pertaining to mode, as distinguished from key. ; based on a scale other than major or minor.